DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled or you need to define rowKey attribute

Question

I had this exception in selecting a single row:

 javax.faces.FacesException: DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled or you need to define rowKey attribute

Here is the table:

<h:form>
    <p:dataTable id="books" value="#{myCardBean.booksList}" var="book" selectionMode="single"
                 selection="#{myCardBean.selectedBook}" rowKey="book.id">

        <p:ajax event="rowSelect" listener="#{myCardBean.onRowSelect}"/>
        <p:ajax event="rowUnselect" listener="#{myCardBean.onRowUnselect}"/>

        <p:column>
            <f:facet name="header">Book ID</f:facet>
            <h:outputText value="#{book.id}"/>
        </p:column>
        <p:column>
            <f:facet name="header">Title</f:facet>
            <h:outputText value="#{book.title}"/>
        </p:column>
    </p:dataTable>
</h:form>

And this is myCardBean :

@ManagedBean
@ViewScoped
@Component
public class MyCardBean implements Serializable {

@Autowired
private BookDao bookDao;
private List<Book> booksList;
private Book selectedBook;

@PostConstruct
public void init() {
    userCard();
}

@Transactional
public List<Book> userCard() {
    booksList = bookDao.findAllBooks();
    System.out.println("all Books size: " + booksList.size() + " books list type: " + booksList); // 3 , list of Object

    return booksList;
}

public void onRowSelect(SelectEvent event) {
    System.out.println("row selected, " + event.getObject());
}

public void onRowUnselect(UnselectEvent event) {
}
//getter/setter for selectedBook and bookList

And this is Book model class:

public class Book implements Serializable {

@Id
@GeneratedValue
private Integer id;
@Column(nullable = false)
private String title;
//...

I defined rowKey and Selection and selectionMode in datatable

I have no idea why should i got this error?!

should id be String instead of Integer?

Why do you use @Transactional in managed beans? It strictly belongs to the service layer (where you defined BookDao). — Tiny

Kukeltje Kukeltje · Accepted Answer · 2015-05-02T22:35:51

Your rowkey is (again) defined wrong. It should be #{book.id} as can be seen in the PrimeFaces showcase. Not sure it is the only error, but I stopped reading further when I encountered this one.

Please investigate more yourself. StackOverflow is not a free training or consultancy site

DataModel must implement org.primefaces.model.SelectableDataModel when selection is enabled or you need to define rowKey attribute

1 Answers